Thermo-controlled gas-oven.



B. E. MEACHAM.

THERMO CNTROLLED GAS OVEN.

APPLlcAlou men ma. 23. lele.

1 ,273,644. Patented J |115r 23, 1918` 2 SHEETS-SHEET I.

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B. E. MEACHAM.

HEHMo CONTROLLED GAS ovEN.

APPLICATION flLED FEB.23. |916,

Patented July 23, 1918.

2 SHEE TS-SHEET 2.

BENJAMIN E. MEAOHAM, 0F LORAIN, OHIO 0F ST. `LOUIS, MISSOURI, A. G

sssIeNoa To Ansmann TovE courait?, oar-cannon or New maaar.

THERMO-CONTROLLED GAS-OVEN.

To all whom t may concern.'

Be it known that I, BENJAMIN E. MEACHAM, a citizen of the United States,residing at Lorain, in the county of Lorain and State of Ohio, haveinvented certain new and useful Improvements in Thermo- ControlledGas-Ovens, of which the following is a specification, reference beinghad therein to the accompanying drawing.

This invention relates to improvements in thermo-controlled gas-ovens,and the object of the invention is to so arran e and locate the parts ofthe thermo-regu ating means as to immediately subject it to theiniiuence of a lowered temperature in the oven occasioned by theopeningy of the oven door, whereby an immediate and increased flow ofgas isfobtained to restabIish yand maintain a uniform temperaturethroughout the oven chamber.

This invention pertains to that class of gas ovens in which the heatwithin the oven 1s controlled by a thermo-actuated gas valve, for thepurpose of maintaining a desired predetermined heat within the ovencham- .ber, and the desired predetermined heat capable of being adjustedtosuit the varying conditions of cooking different kinds of Inthermo-regulated ovens heretofore known to me, the wthermo-regulatingmeans is so located that there is a great lag in the effect thereof byreason of a cooling or low- Jering of the tem erature in the oven due tothe opening of the oven door, and therefore a delay and lag in theincrease of the gas How bythe thermo-regulated means to reestablish andmaintain a uniform predetermined temperaturegwithin the oven chamber. yi E f In thermo-actuated devices, there-is a lag in their o eration inresponse to either the rising nor owering of the temperature, because ofthe time required, im the first instance, to bring the temperature ofthe therino-device' up to the increased temperature, and due, in thesecond instance, to the time required to cool the theme-regulated device in` the lowering temperature, and this may be aptl referred to asthe lag 1u the operation of' theI thermo-actuated device. By reason ofthis-"fact, thehun-controlled gas-ovens heretofore known to nie, havenot quickly responded to the changes in the temperature of the ovenchamber, which I Specioatton ot Letters Patent.

Application led February 23, 1916. Serial No.

-in the cool zone of the oven Patented July 23, 191s. 79,928.

have discovered is due largely, if not wholly, to the location of thethermo-actuated devices in the oven chamber.

I overcome this objection in thermo-controlled ovens, heretofore knownto me, by so placing the thermo-actuated member that it 1s Within thezone of the cool ortion of the oven caused by the opening o the ovendoor, and by reason of this, it is subjected to the cool air zone and,therefore, quickly responds to the lowered temperature within the oven,and correspondingly quickly increases the flow of gas to restablish andmaintain` a uniform pre-determined heat within the oven chamber.

That portion of the oven chamber which is at the loven door opening andis usually the front end of the oven chamber, is the coolest zone of thechamber, due to the opening o'f the/oven door, and for the purposes ofthis improvement will be referred to as the cool zone of the ovenchamber. This portion of the oven chamber, I nd to be the cool zonethereof when it is first being heatgreatest within the chamberimmediately at or adjacent 4the door opening.

My present improvement 1s to make the thermo-device immediately 4subject Vto the lowering of the temperature by the opening of the doorand to raise the cool part of the chamber w en first heating up theoven, to the desired predetermined heat by placing the thermo-actuatedmember wit in t e oven just above the door opening whereby 1t 41s forthe purpose of maintaining a uniform heat throughout the oven, and forthe purpose of restab-- lishing a predetermined heat in the oven after1t is cooled by the opening of the oven door.

I have discovered that when the tempera- -ture at the-center of theovenand back of and where the door-opening is located, will not be atthe same temperature as the center and back portion of the oven, and thethermo-actuated member be ins to cut off the gas before there is a uniorni predetermined temperature throughout the oven. I have alsodiscovered that when the thermo-actuated device is located at about thecenter of the oven, or back of that point, the tempera-ture at said ointis not sufficiently lowered by the ordinary openin of the oven door toexamine the food to bring the thermo-member quickly' under the infiuenceof the change of temperature and, therefore, does not quickly respond toturn on the gas `to quickly reestablish the desired predeterminedtemperature in the oven.

I have also discovered that by placing the thermo-actuated chamber inthe front, or door end of the oven, which is its cool zone, it willnotbegin to turn olf thegas until the temperature throughout the chamberhas been raised to the desired uniform degree and it will quicklyrespond to a lowering o the temperature due to the opening of the ovendoor and, therefore, quickly increase the flow ofy gas and quicklyreestablish and maintain the desired predetermined temperature in theoven.

In the 'accompanying drawing;

Figure 1 is a perspective view of a gas oven constructed with myimprovement.

Fig'. 2 is a front' elevation, partially in section. v

Fig. 3 is a sectional view on the line 3 3 of Fig.. 2, and alsopartiallyin section.

In carry" out my invention, the usual is provided and this casing ovenAcasini.o i has at its nt end the usual oven door 2.

Located in the bottom of the oven is the burner tube 3 communicatingwith any desired form of burner 4, which burner is only diagrammaticallyindicated by dotted lines. Located outside of the oven is a housing 5,in which is locateda thermo-actuated lever 6. y The lower end of thislever 6 `is o` eryatively connected with a needle-valve to control theamount of s flowing into the burner in tube 3. E?)

catedV at the upper end of the housing 5 is a fulcrlim 8 for the upper-end of the lever v6 anda thermo-actuated memberl.) engages the lever 6between itsA fulcrum- 8 and the gas valve 7. This thermo-actuated memberor'irod 9 is of the well-known construction' and 4,is not here shown-indetail and isnot necessary `for .the

understan of my present improvement. .As shown in ig. 1, the housing 5is located at the f nt edge of the oven and the therymo-aetu ted member9 is in the front end of the oven, and as here shown, extends regulatingthe evice to be actua at the desired temperatureby .means ofa suitablehand wheel 1i, and this hand wheel 11 is held at its adjusted positionby means of a suitable latch 12. Since this forms no part of my presentinvention, further description here is unnecessary.

For the purpose yof preventing the gas from being completely cut olf bythe action of the thermo-member 9, upon the lever 6, I provide astop-screw 13, which will be set to let just enough gas How to preventthe burner from bein completely or partially extinguished and t usletting the gas escape within the oven, or the burner poppin out orfiring back and this is one of t e details of my present improvementwhich it l is desired to protect by this application.

As shown, the upper end o the housin 5 is in communication with the gasmanifol 14, through the means of a' branch pipe 15, in which 1s locateda valve 16 forcompletely cutting oif the s to the housing 5.

Owing to the ocation and arrangement of the thermo-actuated member hereshown, it is located in the cool zone of the baking chamber when it isbeing rst heated up to prevent cutting of of the as until the comletechamber is uniform y heated to the esired predetermined temerature, andit is so located that it is uic y influenced by the cool air'entering te chamber when the door is apen and, therefore, qhuickly increasing theow of gas to restab 'sh and maintain within th@ oven chamber the desiredpredetermined temperature, and it obviates the lag in the operation'ofthe thermo-control heretofore existin and it obviates the lag inmaintaining t e desired predetermined uniform heat in the oven chamberin the constructions heretofore used so far as known to me.

` Having thus described, my invention, what Lclaim and desire to secureby Letters Pat- `ent is:

. 1. A as stove having cooking burners, an`

.oven a ousing communicatingwith the s supply for the cooking burnersburners or the oven, the gas supply for the said oven burnerscommunicatlng'with the housinglae y heating the oven, a' fuel valveforthe burner, therein just above the door opemng 10. Thefu1crum 8 isad'ustable for thel pose of a thermo-actuated member operativelyconnected14 with, the fuel valve and exten across thev oven in adirection parallel wi the oven door opening and thereby wholly locatedin the cool Zone of the oven adjacent the door opening to be quicklyaifeeted hy the cooling of the oven to turn on the gas and quicklyreestablish and maintain the desired predetermined temperature Withinthe oven chamber.

3. A gas stove having cooking burners, :in oven, a housingconnnunicating with the gas supply for the cooking burners, a burner forthe oven, the gas supply for the said burner communicating with thehousing, a fuel valve for the oven burner, a thermo actuated memberextending into the oven, a lever operatively connecting the thermomemberwith the fuel valve, and means for limiting the closing movement of thelever and therefore the closing movement of the fuel valve for thepurpose described.

4. A gas stove having cooking burners, un oven, a housing communicatingwith the gas supply for the cooking burners, :1, burner for the oven,the gas supply for the said oven, the gas supply .for the said burnercommunicating with the housing, a lever within the housing, a fuel valvewithin the housing and connected to one end of the said lever. athermo-actuated member extending through the housing engaging the saidlever and also extending into the cool zone of the oven for the purposedescribed.

5. A gas stove having cooking burners, an oven, :t housing communicatingwith the gas supply for the cooking burners, burners for the oven, thegas supply for the said oven burners communicating with the housing, avalve in said housing for controlling the said gas supply to the ovenburners, and a thermo actuated member, extending Within the oven andoperatively associated with said valve for controlling it.

In testimony whereof I hereunto affix my signature in the presence oftwo witnesses.

BENJAMIN E. MEACHAM.

W'itnesses:

GEO. L. GLI'rScH, JOHN J. GLUVNA- Copies or this patent may be obtainedfor five cents each, by addressing the Commissioner of Patents,Washington, D. C.

